ICS841S012DKI REVISION A JULY 20, 2009

18

©2009 Integrated Device Technology, Inc.

ICS841S012DI Data Sheet

CRYSTAL-TO-0.7V DIFFERENTIAL HCSL/LVCMOS FREQUENCY SYNTHESIZER

3. Calculations and Equations.

The purpose of this section is to calculate power dissipation on the IC per HCSL output pair.

HCSL output driver circuit and termination are shown in

Figure 8.

HCSL is a current steering output which sources a maximum of 17mA of current per output. To calculate worst case on-chip power

dissipation, use the following equations which assume a 50

Ω load to ground.

The highest power dissipation occurs at maximum V

Power

= (V

since V

OUT

= I

OUT

* R

L

= (V

= (3.465V – 17mA * 50

Ω) * 17mA

Total Power Dissipation per output pair = 44.5mW

50

Ω

IC

475